646 FEEDS AND FEEDING 



Therefore in computing balanced rations for pigs of various weights with 

 skim milk or buttermilk as the supplement, the minimum amounts of 

 digestible crude protein recommended in the Morrison feeding standards 

 can safely be taken as a guide. (Appendix Table V.) 



If an abundance of skim milk or buttermilk is available on the farm, a 

 greater amount than stated previously may be economically fed, but this 

 excess amount over what the pigs really need to balance their rations 

 will be worth only about half as much or less. After the pig is fed 

 enough protein to balance his ration, he uses the excess merely to make 

 fat instead of lean meat, and consequently full value is not secured from 

 the protein. 



The lessened value of skim milk per 100 Ibs. when more is fed than is 

 needed to balance the ration is clearly shown in trials by Henry at the 

 Wisconsin Station 69 in which a total of 88 pigs, usually weighing 100 Ibs. 

 or over, were fed different proportions of skim milk and corn meal. 

 When 1 to 3 Ibs. of skim milk was fed to 1 Ib. of corn, 327 Ibs. of milk 

 saved 100 Ibs. of corn. However, with 3 to 5 Ibs. of milk for each pound 

 of corn, it required 446 Ibs. of milk to save 100 Ibs. of corn ; and with 5 

 to 7 Ibs. of milk per pound of corn, it took 574 Ibs. of skim milk to save 

 100 Ibs. of corn. In 2 recent trials at the Ohio Station 70 Robison fed 

 different lots of pigs from weights of 33 to 45 Ibs. up to market weights 

 on various proportions of skim milk and corn in comparison with a lot. 

 fed corn and tankage in proper amounts. With corn at 56 cents a bushel 

 and tankage at $60 a ton, skim milk was worth 51 cents per 100 Ibs. when 

 1 Ib. of skim milk was fed with 1 Ib. of corn. When 3 Ibs. of milk were 

 fed per pound of corn, the value of 100 Ibs. of skim milk was reduced to 

 30 cents, and when they were allowed to drink all the skim milk they 

 would take in addition to a full feed of corn, each 100 Ibs. of the milk 

 was worth only 21 cents. 



961. Whole milk Because of the high value of butter fat for human 

 food, it is not profitable to feed whole milk to pigs, except perhaps in 

 the case of orphan pigs raised by hand. (1038) Indeed, it was found in 

 a trial by Linfield at the Montana Station 71 that whole milk is worth only 

 about twice as much per 100 Ibs. as skim milk for pigs. Scheven 72 found 

 that when whole cow's milk was fed to 12-weeks-old pigs, from 900 to 

 1,620 Ibs. was required to produce 100 Ibs. of gain, the average being 

 1,253 Ibs. The trials of Beach at the Connecticut (Storrs) Station 73 show 

 that cow 's milk rich in fat is not as good as milk lower in fat for young 

 pigs, as it is apt to cause digestive disturbances on account of the high 

 fat content. (117) 



962. Buttermilk ; buttermilk products. Buttermilk which has not been 

 diluted by adding the churn washings has practically the same chemical 

 composition as skim milk, and is equal to it in feeding value. This is 



"Wis. Rpt. 1891. "Martiny, Die Milch. 



70 Ohio Bui. 316. "Conn. (Storrs) Bui. 31. 



"Utah Bui. 94. 



